The invention discloses a method for reducing communication cable interference in a substation by adopting a cable cover plate with an aim to achieve the purpose of effectively reducing communication cable interference by placing the cable cover plate optionally in the substation to eliminate interference flux generated by power cables and interference flux generated by self-generated reverse flux integrated power cables. The method includes that n conductive copper columns are mounted on the bottom surface of the cable cover plate along the horizontal direction, and the n is an odd number between 15 and 21; a first conductive copper column is serially connected with a current limit resistor R1, a first electronic switch and an energy storage unit; the second conductive copper column is serially connected with a second current limit resistor R2, and a second electronic switch and the energy storage unit; two ends of the conductive copper column with the largest number are serially connected with a current limit resistor R3 and a milliampere direct-current electronic ammeter; the rest conductive copper columns, with the odd numbers, connected correspondingly to the tail end of the cable cover plate and the conductive copper columns, with the even numbers, connected correspondingly to the head end of the cable cover plate are connected with a grounding grid of the substation; a device used for controlling current collection and switching control of the electronic switches is mounted at the bottom of the cable cover plate.